Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
  • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
  • B23K35/0261—Rods, electrodes or wires
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
  • B23K35/24—Selection of soldering or welding materials proper
  • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
  • B23K35/3053—Fe as the principal constituent

Definitions

• the present invention relates to a non-shielded arc welding method of steel, that is, a method of welding steel under an air atmosphere without using flux or shielded gas.
• Electrode Wires for non-shielded arc welding according to this method has already put to practical use, though in a small quantity.
• the present invention has successfully solved this difficult problem.
• the non-shielded arc welding with healthy deposits can be carried out within a wider range of welding current, by using a consumable solid wire alloyed with a small amount of elements having strong chemical afi'inity to oxygen and nitrogen such as Ti, Zr, Nb, Ta, V, Ce and others and made to form a thin coated layer of aluminium or aluminium alloy.
• the whole surface of bare wires is made to form a thin coated layer of aluminium or aluminium alloy as a core wire for CO shielded welding.
• a core wire for CO shielded welding for example, Japan Patent Publication No. 18,323/ 1959.
• the main object of coating the surface of said wires with aluminium is to control the sputtering during welding which is characteristic of CO welding.
• Secondary objects are de-oxidation effect by aluminium or aluminium alloy; rust-proof measures for core wire and preventive measures for various welding defects due to oxygen. But no special attention is paid to nitrogen under an air atmosphere.
• oxygen and nitrogen should be prevented from being absorbed into the globule formed at the tip of a steel rod or Wire for a consumable electrode, first by aluminium coating on its surface. Even if oxygen and nitrogen are still more absorbed in spite of said coating, their bad effects can be eliminated by the action of special elements (Ti, Zr, Nb, V, Ta, Ce and others) made to include in the steel wire, so that effective non-shielded arc welding can be carried out even at a higher welding current.
• special elements Ti, Zr, Nb, V, Ta, Ce and others
• Table 2 shows the results of said X-ray inspection. As apparent from the Table, except wires B and K, they show 118 (the Japan Industrial Standard) grade 6 be cause of high porosity when the welding current exceeds over 250 a. Wires B and K, the conventional electrode wires for non-shielded arc welding, if not coated with aluminium, show grade 4 in being welded at 250 a., but deteriorate to grade 6 at 450 a. On the other hand, if coated with aluminium, they show grade 1-3 even at 450 a., so that the deposits are quite sound and satisfactory enough to be put into practical use.
• Wires BK includes about 0.04%-0.46% of one or more special elements such as Ti, Zr, Nb, V, Ta and Ce. (When including more than one element, the percentage refers to total amount of the elements which is included.) Accordingly, it will be understood that if electrode wires with a small amount of special elements are coated with aluminium, non-shielded arc welding has become possible even at higher welding current owing to remarkable good effect of aluminium.
• special elements such as Ti, Zr, Nb, V, Ta and Ce.
• the present invention has successfully removed the biggest obstacle in developing a non-shielded arc welding method, by making possible non-shielded arc welding in a wider range of said current, using steel rods or wires including a small amount of said special elements and thin coating with aluminium or aluminium alloy on thin surface as a consumable electrode from which it is considered that the present invention has a great industrial significance.
• non-shielded arc welding has become possible in a Wider range of said current, by coating aluminium or aluminium alloy on the surface of steel rods or wires including a small quantity of said special elements compared with that of the conventional steel rods or wires for non-shielded arc welding.
• the present invention has also succeeded in expanding the range of welding current employed to higher levels, by coating-aluminium or aluminium alloy on the surface of steel rods or wires including the same amount of special elements as the conventional rods or wires for nonshielded arc welding.
• the present invention has also overcome almost all the major obstacles of the conventional nonshielded arc welding, for example, high-speed weldability and preventing the possibility of craters or pores developmg.
• the present invention will be sure to contribute to the rapid progress in the non-shielded arc welding.
• a non-shielded arc welding method wherein an electric arc is maintained from the work to a consumable electrode
• the improvement which comprises an electrode consisting of a steel rod or wire consisting of 0.070.11% carbon, OBS-1.33% manganese, 0.24-0.48% silicon, 0.16-0.21%.
• phosphorus, 0.018-0.023% sulfur at least 0.03-0.5 percent by weight of one or more of an element selected from the group consisting of titanium, zirconium, niobium, tantalum, vanadium and cerium, and the balance iron, and having an aluminum or aluminum alloy layer on the surface thereof.
• An electrode rod or wire consisting of a steel rod or wire consisting of 0.07-0.11% carbon, 0.95l.33% manganese, 0.24-0.48% silicon, 0.160.21% phosphorus, 0.018-0.023% sulfur, 0.03-0.5 percent by weight of one or more of an element selected from the group consisting of titanium, zirconium, niobium, tantalum, vanadium and cerium, and the balance iron, and having an aluminum or aluminum alloy layer on the surface thereof.
• An electrode rod or Wire of claim 2 wherein the thickness of the aluminum layer is from 0.003 mm. to 0.1 mm.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Arc Welding In General (AREA)
• Nonmetallic Welding Materials (AREA)

Applications Claiming Priority (1)

Publications (1)

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ID=13751979

Family Applications (1)

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Citations (4)

• 1967
  • 1967-12-11 GB GB56138/67A patent/GB1176855A/en not_active Expired
  • 1967-12-12 SE SE17066/67A patent/SE345086B/xx unknown
  • 1967-12-12 US US689806A patent/US3542997A/en not_active Expired - Lifetime
  • 1967-12-14 DE DE19671690634 patent/DE1690634A1/de active Pending
  • 1967-12-14 CH CH1759767A patent/CH467128A/fr unknown

Patent Citations (4)

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